Fix DebugDFatalIfMarkingClosedStreamWriteBlocked test This test was attempting to run faster by only running with the first version, and that was actually causing a gap in test coverage, which was uncovered by reordering versions. This CL fixes the coverage gap and makes sure the test passes for all versions. gfe-relnote: n/a, test-only PiperOrigin-RevId: 304064435 Change-Id: I5c00fef9b48ca6f8c360fc7377133b34ff3c6d45